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Sasuke: What...is the other secret...of the Mangekyou Sharingan?
Itachi: Ah...yes
Sasuke: speak
Itachi: If you want to know...come with me
Sasuke: What do you mean...
Itachi: To achieve our goal, we need the same eyes as ours...
Sasuke: I said before, quit that bullshit. I will kill you and then kill Madara. That's all I want
Itachi: ...if you do not come with me, I will resort to take your eyes by force. Don't make me do it
Sasuke: ...
Itachi: I will say this one last time... Come with us
Sasuke: I refuse!!
As soon as Sasuke had spoken, he moved in a flash and cut Itachi into two with the Kusanagi sword.
Itachi: It's regrettable but...in front of the Mangekyou Sharingan, your efforts are futile....no matter how great your power, or how fast your speed is...
The Itachi that was severed by Sasuke grew in size and surrounded the area. Sasuke found himself inside the Uchiha clan's town the next instant.
Sasuke: ...cheh
Itachi: You said your eyes is able to see through genjutsu... however, this jutsu is an exception...Only I hold the ability to control everything...in the world of Tsukuyomi...
Itachi then created the illusion of killing the clan members one after another.
Sasuke: !
Then Itachi stopped in front of a house.
Sasuke's thoughts: This place is...
Sasuke's father looked out from the house's door.
Itachi rushed in.
Sasuke's thoughts: Shit...! These are all created by that bastard's genjutsu...! Go away, make it disappear!
Blood splashed out from the inside of the house.
Sasuke's heart beat loudly.
Itachi: It's over. I will destroy your mind in the next genjutsu I am showing you...!
Itachi looked behind himself.
As soon as he did that, a snake appeared from the floor of the hideout, and a sword emerged from its mouth.
The blade grazed Itachi's shoulder.
Blood came out from Itachi's shoulder.
Itachi: Argh...
More snakes emerged from the ground and entwined Itachi.
Sasuke went behind and blocked upwards with his right arm.
Sasuke: When you use the Eyes, you are completely defenseless. You belittled me
Itachi: You used kuchiyose under this hideout...prior to this...
Sasuke: It's over! (Katon: Rekka Shouha!! <fire technique: rush of the great fire>)
The surroundings burned with greater intensity.
Sasuke's thoughts: It must be that bastard's true body this time...
The flame slowly died out.
Sasuke: ...
A human form appeared from the fire.
Sasuke: !!
Itachi: You thought it was over...isn't it?
Itachi emerged from the dying flames.
Black flames surrounded the place.
A smile appeared on Sasuke's face.
In an instant, Itachi's back was impaled by the Chidori sword.
Sasuke: You are completely defenseless after using the Eyes too, isn't it
Sasuke disappeared from Itachi's sight.
Itachi: ...urgh...
Sasuke: Now my Eyes can see. You are the real body, there is no mistake about it
Itachi: ...
Sasuke: Right, speak now. The other secret of the Mangekyou Sharingan...!
__________________

The other ability of the Mangekyou Sharingan is to possess (someone else's) Sharingan.
Madara intended to have Sasuke's body for his own.
Previously, he had possessed Shisui's...
However, his current body is not Shisui's.

Scene change to Naruto

Naruto: Who are you dattebayo?
Tobi: There is someone among you who knows me
Everyone: ?!
Tobi removed his mask.
Itachi: That person is dead...This eye has no other purpose except for the Uchiha
Scene change to Naruto.
Kakashi: ...no way?!
Tobi: Long time no see, Kakashi

Itachi told sometings to Sasuke
Madara also have a brother, too.(yonger brother)
Madara and his yonger brother always compete each other
And when they open their MS(?), they became special in ther clan

but, just then, Madara's body changed strangely
he has powerful ability in his eyes, in stead, his power fall in to evil
Madara felt hopeless...(and he was blind)

Madara: I can not forgive you.
Brother: Ah.........

Madara killed his brother and had his eyes
Madara can see bright again and never blind again
He has MS forever